Trump will speak at the Phoenix Convention Center, after aides said demand for tickets exceeded space at the original venue, the Biltmore Resort and Spa.

"We received 4,000 RSVPS in 2¹/? hours," said Trump campaign chairman Corey Lewandowski. 

Trump has come under fire for his anti-Mexican comments made at his campaign launch last month.

"They're sending people who have a lot of problems. They're bringing drugs. They're bringing crime. They're rapists. And some, I assume, are good people," he said at the time.

The blowback against Trump included NBC, Univision, Macy's and NASCAR severing corporate partnerships with him.